Research Highlights, Precision Sensing Solutions for Improved NUE in Corn and Wheat Production Systems

July 27, 2006

Cotton plant height collected by hand versus plant height measured using a sonar device. Ninety three percent of the variation in plant height could be explained using this indirect method of measurement.

July 17, 2006

Wheat OFIT (On-farm INSEY trials) results, 2006

Table 1. Nitrogen fertilizer applied for Wheat OFIT 2006 across sites, OK.

Trt	Preplant N lb ac^-1	Topdress lb ac^-1	Topdress N Applied, lb ac^-1
Trt	Preplant N lb ac^-1	Topdress lb ac^-1	Lahoma	LCB	Perkins
1	0	0	0	0	0
2	0	Flat	45	45	45
3	0	Flat	90	90	90
4	45	Flat	45	45	45
5	45	0	0	0	0
6	90	0	0	0	0
7	0	NFOA-CV	53	55	26
8	45	NFOA-CV	22	20	16
9	0	NFOA-Flat	53	55	26
10	45	NFOA-Flat	22	20	16
11	0	0	0	0	0
12	0	RI-NFOA	36	28	19
13	45	RI-NFOA	11	12	11

Table 2. Grain Yield for Wheat OFIT 2006 across sites, OK.

Trt	Preplant N lb ac^-1	Topdress lb ac^-1	Grain Yield, bu ac^-1
Trt	Preplant N lb ac^-1	Topdress lb ac^-1	Lahoma	LCB	Perkins
1	0	0	33	41	19
2	0	Flat (45)	44	46	21
3	0	Flat (90)	50	50	23
4	45	Flat (45)	53	47	21
5	45	0	45	48	21
6	90	0	51	48	24
7	0	NFOA-CV	46	51	21
8	45	NFOA-CV	49	52	21
9	0	NFOA-Flat	44	49	20
10	45	NFOA-Flat	51	45	22
11	0	0	29	44	16
12	0	RI-NFOA	39	50	23
13	45	RI-NFOA	50	46	26

Table 3. Profit earned for Wheat OFIT 2006 across sites, OK.

Trt	Preplant N lb ac^-1	Topdress lb ac^-1	Profit, $ ac^-1
Trt	Preplant N lb ac^-1	Topdress lb ac^-1	Lahoma	LCB	Perkins
1	0	0	150	184	87
2	0	Flat	178	190	76
3	0	Flat	190	189	67
4	45	Flat	203	176	57
5	45	0	185	199	76
6	90	0	194	178	72
7	0	NFOA-CV	187	208	83
8	45	NFOA-CV	196	207	68
9	0	NFOA-Flat	177	197	79
10	45	NFOA-Flat	203	175	72
11	0	0	131	197	73
12	0	RI-NFOA	162	213	97
13	45	RI-NFOA	204	184	93

Preplant N fertilizer price lb^-1: $ 0.40
Topdress N fertilizer price lb^-1: $0.40
Wheat grain price bu^-1: $4.50

3 Point Trials 2006
Profit maximized in 2 of 3 trials using 0-N preplant and the variable N rate applicator (treatment 3).

Table 1. Nitrogen use efficiency and N fertilizer applied for 2006 Wheat 3 PT Trial at Efaw, Hennessey and Chickasha, OK.

Trt	Preplant N, lb ac^-1	Topdress N*	Total N Applied, lb ac^-1			Nitrogen Use Efficiency, %
Trt	Preplant N, lb ac^-1	Topdress N*	Efaw	Hennessey	Chickasha	Efaw	Hennessey	Chickasha
1	0	0	0	0	0	-	-	-
2	120	0	120	120	120	6	6	0
3	0	NFOA	23	54	32	38	0	11
4	45	NFOA	55	83	59	20	6	1
5	0	SBNRC	22	39	26	27	10	0
6	45	SBNRC	57	76	55	20	7	0
7	45		80	99	95	12	0